irq_ser.c

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/*******************************************************************************
 * 
 * ARM Strategic Support Group
 *
 *******************************************************************************/

/*******************************************************************************
 *
 * Module       : irq_ser.c
 * Description  : Setups 77790 IRQ registers and serives the IRQ's (timer and 
 *                button interrupt requests)
 * Status       : complete
 * Platform     : AEB-1
 * History      : 980416 ASloss
 *
 *                - added button interrupt service
 *                - added header information
 *
 * Notes        : Refer to the Sharp 77790 documentation 
 *
 *******************************************************************************/

/*******************************************************************************
 * IMPORT
 *******************************************************************************/

#include "traffic.h"
#include "macros.h"

/*******************************************************************************
 * MACRO'S
 *******************************************************************************/

// none...

/*****************************************************************************
 * EXTERN's
 *****************************************************************************/

extern void handler_irq(void);
extern void SetupSVC(void);
extern int  Angel_IRQ_Address;

/*****************************************************************************
 * GLOBALS
 *****************************************************************************/


/*****************************************************************************
 * ROUTINES
 *****************************************************************************/

/* -- irq_installhandler ------------------------------------------------------
 *                                                            
 * Description  : Places a branch instruction for the routine into the defined 
 *                'vector' location - this function returns the original 
 *                contents of the 'vector      
 *
 * Parameters   : unsigned routine - IRQ handler
 *		: unsigned *vector - IRQ vector   
 * Return       : 
 * Notes        : 'routine' MUST BE WITHIN A  RANGE OF 32Mbytes FROM 'vector'
 *                                                                             
 */

static void irq_installhandler (unsigned routine, unsigned *vector) 
{
unsigned old_vector_value = 0;
unsigned *absolute;   
  
   old_vector_value = 0;

	/*******************************************************************************	
	 * Now the inverse must be done on the original vector to retrieve the Angel   *
	 * IRQ Handler routine .                                                       *
	 *******************************************************************************/
   
   old_vector_value  = *vector;  	 // Get old vector contents ....................
   old_vector_value ^= 0xe59ff000;	 // Mask off the instruction to get the offset
 
	// ** calculate absolute address

   absolute	     	= (unsigned *) (0x18 + old_vector_value+0x8); 
					// IRQ Address
   Angel_IRQ_Address 	= *absolute; 	// chain Angel Interrupt Handler	  
   *absolute		= routine; 	// IRQ handler

}

/* -- irq_inittimer1 ----------------------------------------------------------
 *                                                            
 * Description  : Initialises the counter timer (most work done by 
 *		  irq_auxctstart)      
 *
 * Parameters   : none...   
 * Return       : none...
 * Notes        : none...
 *                                                                             
 */

static void irq_inittimer1 (void)
{

}

// new code ...................

/*
 * Update the register on the target which masks the irq passed to the IC.
 * This routine is target-specific.  Turn the interrupt source on.
 */
void uHALir_UnmaskIrq(unsigned irq) 
{
   *(volatile int*)INTMSK &= ~((1 << INT_GLOBAL) | (1 << irq));   /* Force global disable OFF */
}


/* -- irq_initbutton ---------------------------------------------------------
 *                                                            
 * Description  :  Initialises the button interrupt    
 *
 * Parameters   : none...   
 * Return       : none...
 * Notes        : none...
 *                                                                             
 */

static void irq_initbutton (void)
{

	// Bitwise OR incase an existing set of Interrupts have been .....
	// set by Angel Debug Monitor ....................................
		
	*(volatile int*)INTMSK &= ~((1 << INT_GLOBAL) | (1 <<10) | (1<<0));

  *(unsigned *)IOPCON 	|= IO_ENABLE_INT0; 			// enable int0
  *(unsigned *)IOPCON	|= IO_ACTIVE_HIGH_INT0; 	// set as active high
  *(unsigned *)IOPCON	|= IO_RISING_EDGE_INT0;		// allow for RISING EDGE
}

// end of new code..........

/******************************************************************************
* IRQHandler                                                                  *
*                                                                             *
* This IRQ handler only services two interrupt source - the Counter Timer 1   *
* source and the button interrupt. When this is sensed the handler resets     *
* the counter interrupt - and increments the AuxCT_repetitions global         *
* variable...                                                                 *
*                                                                             *
* THIS PORTION OF CODE MUST BE COMPILED USING THE ARM STATE COMPILER ARMCC    *
* EVEN WHEN USED IN A THUMB STATE ENVIRONMENT. FAILURE TO DO THIS WOULD RESULT*
* IN UNPREDICTABLE RETURNS FROM THE IRQ HANDLER.                              *
*                                                                             *
*******************************************************************************/

/* -- irq_auxtimer ------------------------------------------------------------
 *
 * Description  : handles the aux timer interrupt.
 *
 * Parameters   : none...
 * Return       : none...
 * Notes        : Other interrupt sources are handled by angel. See 
 *		  ang_irq_ven.s
 *
 *
 */ 



/* -- irq_buttonpress -----------------------------------------------------------
 *
 * Description  : handles the button press interrupt...
 *
 * Parameters   : none...
 * Return       : none...
 * Notes        : none...
 *
 */ 

void  irq_buttonpress (void) 
{
   /* Read in the Interrupt source .................................. */

	traffic_interrupt ();		// Call traffic sequencer .......
	
	*(unsigned *) INTPND |= INT_SW3_MASK;
	
}

/* -- irq_init ----------------------------------------------------------------
 * 
 * Description  : This module is where all system setup would be placed - in 
 *                this case it is only Counter/Timer that we are initialising 
 *                so we only have a routine to initialise this. Also called 
 *                from here is the Interrupt Handler install routine and 
 *                initialize button interrupt
 *
 * Parameters   : none...
 * Return       : none...
 * Notes        : none...
 *
 */

void irq_init (void)
{
	SetupSVC();		/* This is necessary if Angel is not running
				 *  on the target (as when running semi-hosted
				 *  from E-Ice) otherwise, let Angel handle it */

	irq_inittimer1 ();
	irq_initbutton ();

	irq_installhandler ((unsigned)handler_irq, IRQVector);
}


/*******************************************************************************
 * END OF irq.c
 *******************************************************************************/